What is APK?

APK file is a file extension for the Android application package file. These files are distributed by Google Play and other third-party app stores, or you can download them manually from an APK site if you have a developer account.

APK files may contain executable code, resources like images or media content, configuration settings for devices such as displays with different pixel densities (e.g., high density), certificates of authenticity to verify that the software came from the original author/publisher,dynamic libraries and so on.

The most common use case is installing applications directly onto your phone without having to reinstall it every time there’s an update available; this way updates happen automatically through a process called OTA – over-the-air.